docs: change slot to # (#5858)

* docs(SwipeCell): change "slot" to "v-slot"

* docs(SwipeCell): change `v-slot` to`#`

* docs(cell): change `slot` to `#`

* docs(checkbox): change `slot` to `v-slot`

* docs(field): change `slot` to `v-slot`

* docs(checkbox): remove wrong comment

* docs(radio): change `slot` to `#`

* docs(search): change `slot` to `#`

* docs(slider): change `slot` to `#`

* docs(switch): change `slot` to `#`

* docs(PullRefresh): change `slot` to `#`

* docs(collapse): change `slot` to `#`

* docs(panel): change `slot` to `#`

* docs(swipe): change `slot` to `#`

* docs(navbar): change `slot` to `#`

* docs(tab): change `slot` to `#`

* docs(tabber): change `slot` to `#`

* docs(TreeSelect): change `slot` to `#`

* docs(card): change `slot` to `#`

* docs(submitBar): change `slot` to `#`

* docs(sku): change `slot` to `#` unsure

* docs(cell): delete waste blank line

* docs(panel): fix indentation

* docs(PullRefresh): change "count" to "Refresh Count"

* docs(radio): delete waste blank line

* docs(search): move props above the event

* docs(submitBar): delete waste `<span>`

* docs(swipCell): delete waste blank line

* docs(tabbar): merge `<img>` into one line

src/sku/README.md

@@ -81,14 +81,14 @@ export default {
   @add-cart="onAddCartClicked"
 >
   <!-- custom sku-header-price -->
-  <template slot="sku-header-price" slot-scope="props">
+  <template #sku-header-price="props">
     <div class="van-sku__goods-price">
       <span class="van-sku__price-symbol">￥</span><span class="van-sku__price-num">{{ props.price }}</span>
     </div>
   </template>
 
   <!-- custom sku actions -->
-  <template slot="sku-actions" slot-scope="props">
+  <template #sku-actions="props">
     <div class="van-sku-actions">
       <van-button
         square

src/sku/README.zh-CN.md

@@ -83,14 +83,14 @@ export default {
   @add-cart="onAddCartClicked"
 >
   <!-- 自定义 sku-header-price -->
-  <template slot="sku-header-price" slot-scope="props">
+  <template #sku-header-price="props">
     <div class="van-sku__goods-price">
       <span class="van-sku__price-symbol">￥</span><span class="van-sku__price-num">{{ props.price }}</span>
     </div>
   </template>
 
   <!-- 自定义 sku actions -->
-  <template slot="sku-actions" slot-scope="props">
+  <template #sku-actions="props">
     <div class="van-sku-actions">
       <van-button
         square